Reamer



F. L EMORY.

REAMER.

APPLICATION FILED APR. i5, 1919.

1,37s,339 Patented May 17,1921.

ggiwzzw ATTORNEY,

UNlTED fi'lTE ROBERT J. EMORY, OF NEWARK, NEW JERSEY.

REAMER.

Specification of Letters Patent. Patented lllgty 17 1921.

Application filed. April 15, 1919. Serial No. 290,205.

To all whom it may concern:

it known that 1, ROBERT J. EMORY, a citlzen of the United States, and resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Reamers, of which the following is a specification.

The invention relates to an adjustable reamer of the type of such tools in which the diameter can be varied at will so asto ream different size holes within the capacity of the tool.

In known devices of this type the elements which go to make up the. cutting edges have been adjustable in the body portion of the tool by various means but these attempts to provide for adjustment have not proved satisfactory and in the case of small size reamers of this type it is physically impossible to provide forboth sensitive adjustment and for the desired rigidity of the cutting members.

Accordingly one of the objects of the invention is to provide a simple form of reamer which will be characterized by rigidity of cutting edges and incidental freedom from chattering and at the same time possess means providing microscopic adjustment to fit the variable sizeopenings to be reamed.

Broadly, this object is attained by forming the cutting edges in the body portion of the tool so as to maintain the rigidity of parts present inthe fixed-diametered reamers and to provide a bearing member adjustable radially relative to the axis of rotation of the tool thereby to vary the maximum diameter of the tool.

The invention further features a slmple form of construction which can be manufacture-d cheaply compared with devices of this general type and incidental to this desideratum another object of the invention is to provide a device of the class described which can be machined with relatively small changes in present manufacturing methods and in which the relatively movable parts are designed to minimize wear and can be readily replaced if necessary.

Various other objects and advantages of the invention will be in part obvious from an inspection of the accompanying drawings andin part will be more fully set forth in the following particular description ofone form of mechanism embodying my invention, and the inventlon also consists in certain new and novel features of construction and combination of parts hereinafter set forth and cla med; 1 1 Referring to, the accompanying draw- 1ngs:-

preferred embodiment of the invention;

Fig.2 is a similar'viewpartially in axial section;

Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig 2; and

. A reamer 10 of the fluted cylindrical type i has been selected to show the invention but it isobvious that the invention is applicable toother forms of reamers andwwith obvious mechanical changes is applied to other similar formsof cuttingtools, such as taps and; broaches, designed to lit in holes to be machined. a

The reamer mcludes the usual shaft or as by fluting, one or more cutting edges 12 fashioned in any manner usual with the conventional form of fixed-diametered reamers.

The device differs from the conventional form in having the unfiuted side of the reamer smooth to form a back bearing'surface 12.

Asthus far described the tool functions as does the conventional reamer for in both cases the cutting edges are forinedin massive body portion ofthe tool.,

Thesurface 12 is provided with a longitudinally extending slot 13 in which is fitted a long bearing strip 14 of a length at least coextensive with'the cutting part of the tool.

Thisstrip is'held in place by bands 15 in the form of split rings which fit incircumferential grooves 16, formed in the body 11' and in the strip adjacent opposite. ends 17. This construction permits freedom of movement of the strip radially of the toolbut V Figure 1 is'a view in side elevation ofa I n a body l1, 1n the side of which are formed,

the

defeats any tendency of the strip to move longitudinally. The bodyportion' is provided opposite the center of the strip with a threaded aperture 18 which extends from the bottom one of thegrooves 19 forming the cuttin edges 12 to the bottom of the slot 13. small headed set screw 20 into the aperture 18 is positioned to moveinto bearing engagement with the strip 14 to move the same radially and thus move the outer, hole-engaging surface 21 of the strip from its normal position flush with the surface 12 into any desired position spaced from the surface 12. V

In operation and assuming that it is desired to ream a hole to a diameter greater than the diameter which'the tool would cut when the strip 1 1 is fully seated in its guiding slot, the screw 20 is adjusted until the measured diameter between the surface 21 and the diametrically opposite cutting edge 12 calipers to the desired measurement. Due to its rigidity and to the fact that the spring bands apply equal pressureat points on both sides of the screw 21 equally spaced therefrom, the strip will move parallel or substantially parallel to the axis of the tool springing the holding rings at opposite ends.

Releasing the pressure of the set screw will permit the rings to react on the strip and move the same toward its seated position in the slot.

In the alternate it may be desired in some forms of work to set the strip at variable 7 angles to the axis of the tool. In this case the tool can be provided with two apertures 21 and 22 similar to the aperture 18 and positioned adjacent opposite ends of the strip. Screws similar to the screw 20 may be inserted in these end apertures and by suitably adjusting the screws any desired angularity of the strip within the capacity of the tool may be attained. In this operation when a screw is turned to move one end of to utilize this strip as an additional cutting member and this may be desirable in situations where a continuous series of cutting edges about the entire surface of the tool is desired.

By means of a device of thischaracter I tain novel features of my invention, it will V be understood thatvarious omissions, substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

Having thus described my invention, I claim 1. A tool designed to engage in a hole to machine the same, said tool including a shaft provided with a slot extending lengthwise thereof, a bearing strip fitted in said slot, said shaft and strip provided with recesses coacting to form a continuous peripheral groove, a retaining ring fitted in said groove for preventin relative lateral movement between the strip and shaft, and a set screw threaded diametrically through the shaft and engaging-the strip to advance the same radially out of the slot.

2. A tool designed to engage in a hole to machine the same, said tool including a shaft provided with a slot extending lengthwise thereof, a bearing strip fitted in said slot,

said shaft and strip being provided with recesses coacting to form two continuous peripheral grooves, expansible retaining rings fitted in said grooves for preventingrelative lateral movement between the strip and the shaft, said shaft having there through three threaded passages intermediate the rings, whereby upon the insertion of a threaded member into one of the passages, the strip can be given either a bodilyparallel movement, or an angular movement. a

Signed at New York cit in the county of New York and State of ew York this 8th day of April, A. D. 1919. V

ROBERT J. EMORY. 

